Fix content alignment with simplified app

- Fix repo path in devcontainer postStartCommand (dog-shelter → pets-workshop)
- Remove unused port 5000 from forwardPorts
- Fix line number references in 1-hour and full-day exercises

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: GeekTrainer

content/1-hour/1-add-endpoint.md

@@ -34,7 +34,7 @@ Let's build our new route in our Flask backend with the help of code completion.
 
 1. Return to your IDE with the project open.
 2. Open **server/app.py**.
-3. Locate the comment which reads `## HERE`, which should be at line 68.
+3. Locate the comment which reads `## HERE`, which should be at line 69.
 4. Delete the comment to ensure there isn't any confusion for Copilot, and leave your cursor there.
 5. Begin adding the code to create the route to return all breeds from an endpoint of **api/breeds** by typing the following:
 

content/full-day/3-codespaces.md

@@ -85,15 +85,14 @@ Before rebuilding the container, let's add **GitHub.copilot** to the list of ext
     ```json
     "forwardPorts": [
 		4321,
-		5100,
-		5000
+		5100
 	],
     ```
 
 6. Just below the list of ports, add the command to run the startup script to the container definition:
 
     ```json
-    "postStartCommand": "chmod +x /workspaces/dog-shelter/scripts/start-app.sh && /workspaces/dog-shelter/scripts/start-app.sh",
+    "postStartCommand": "chmod +x /workspaces/pets-workshop/scripts/start-app.sh && /workspaces/pets-workshop/scripts/start-app.sh",
     ```
 
 You've now defined a custom container!

content/full-day/6-code.md

@@ -37,7 +37,7 @@ Let's build our new route in our Flask backend with the help of code completion.
 
 1. Return to your codespace, or reopen it by navigating to your repository and selecting **Code** > **Codespaces** and the name of your codespace.
 2. Open **server/app.py**.
-3. Locate the section of code at the very bottom which launches the server, and put your cursor just above it. This should be line 70, and the code will be:
+3. Locate the section of code at the very bottom which launches the server, and put your cursor just above it. This should be line 71, and the code will be:
 
     ```python
     if __name__ == '__main__':